The Testament of Sister New Devil is a tV series anime that premiered in winter 2015, produced by Production IMS.

About the production: the story comes from a light novel, there are 12 episodes of about 24 minutes and its current status is "finished".

Its main genres are action, ecchi, fantasy and romance, with themes such as Nudity, Female Harem, Heterosexual and Primarily Female Cast.

On AniList, The Testament of Sister New Devil has an average score of 63%, an average score, and appears on 164,809 users' lists.

The franchise continues in or follows from: Shinmai Maou no Testament: Toujou Basara no Hard Sweet na Nichijou.

When a pair of sexy girls, Maria and Mio, come to live with high school student Basara Toujou, his life changes forever. The two girls have a secret that they don’t keep for long—Maria is a succubus, and Mio is a future Demon Lord. But Basara has a secret of his own—he’s the last descendant from a clan of demon-fighting heroes. To make things even more complicated, the girls force Basara into a master-servant contract, and Basara ends up becoming their master! What happens when you put a succubus, a demoness, and a demon-fighting hero under the same roof? They form a bond that will help them to take on anything! (Source: Funimation)

Official synopsis from AniList.